LONDON, ENGLAND - APRIL 23: Prince Harry, Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge after cheering on runners at the start of the 2017 Virgin Money London Marathon on April 23, 2017 in London, England. The Royals are spearheading Heads Together, in partnership with eight leading mental health charities, that are tackling stigma, raising awareness, and providing vital help for people with mental health problems. (Photo by Chris Jackson/Getty Images)